Yeah ive got the same thing happening , really noisy on cold starts , to the point where my 6 year old asked ' dad is your engine going to fall out? it sounds like theres no bolts holding the engine in" just started doing it one day at 65000kms , took it to Nissan and just got **%$$@ around , i asked did they hear the noise and they tried to sell me new tyres?? , i asked again to be told the mechanic couldnt hear anything abnormal!! My son has travelled in the car since the day i picked it up (new car) if he can pick an abnormal sound coming from the engine bay why can a trained Nissan machanic not hear it , tappet type noise at 100kmh he "couldnt hear" either , now losing confidence in the car pretty quickly ..... should have bought a hilux!!